Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
  • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
  • D04B15/48—Thread-feeding devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2/00—Friction-grip releasable fastenings
  • F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
  • F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
  • F16B2/065—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using screw-thread elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
  • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load

Definitions

• the invention relates to a device, in particular a yarn feeding device, with a clamp for attachment of the device to a carrier, such as a knitting machine, and provided on the terminal clamping screw.
• DE 102 19 537 B4 discloses a yarn feeding device as it is used in a larger number of knitting machines to deliver thread to a knitting point.
• the yarn feeding device has a central holder, which is provided at one end with a mounting clamp. This clamp is used to support the yarn feeding device on a support, for example in the form of a metal ring, which is provided on a circular knitting machine, and from which the various yarn feeding devices are away in the radial direction.
• a clamping screw is provided, which can be tightened to clamp the clamp to the carrier.
• the clamping screw is screwed into a corresponding threaded hole. If the holder of the yarn feeding device as usual made of steel, this threaded hole can be inserted directly into the holder. On the other hand, if the holder consists of a less solid material, such as plastic, the threaded hole is usually formed by a nut which is inserted into the plastic.
• the fixing screw If the fixing screw is tightened too tight, it may break or damage the clamp, causing it to deform, eg widen. Due to such mindfulness, the yarn feeding device is totally useless, because it can not be securely attached to the knitting machine.
• the device according to the invention is primarily a yarn feeding device. This serves to supply a thread consumption point controlled thread.
• the device may also be another device, such as sensors, yarn feelers or others.
• the device has a clamp with a clamping screw, wherein the clamp is associated with a force limiting means for limiting the force applied by the clamping screw force.
• the force limiting means is adjusted to permit, on the one hand, the generation of a clamping force large enough to provide a sufficiently firm support of the device on the carrier.
• the force limiting means limits the force acting on the terminal expanding force to a value that certainly does not lead to damage to the terminal. This opens up the possibility of application, in particular in terminals made of a material whose strength could otherwise be exceeded by over tightening the clamping screw. This is especially true for materials whose strength is lower than the strength of the carrier, in particular for plastic or non-ferrous metal, such as zinc die-casting.
• the force limiting means thus allows the carrier and the clamp of a uniform material lower strength, such as plastic or zinc die-cast can be constructed, with no risk of damage to the terminal by over tightening the clamping screw.
• the clamping screw has e.g. a hand-operated head, with which larger or smaller torques can be generated depending on the manual power of the operator.
• the head preferably has at least such a diameter that the clamping screw can also be tightened by persons who apply only a small hand force. However, experience has shown that it is possible for stronger persons to generate very high torques.
• the force limiting means can be formed in that a metal head of the clamping screw is encapsulated with a plastic part, which allows only a limited torque transmission to the metal head of the clamping screw and otherwise slips.
• the encapsulation may be elastic and engage around a non-circular screw head, for example a hexagonal head, in a form-fitting manner.
• a cogging torque is exceeded, the overmolded head gives way elastically and no longer takes the hexagon head with it.
• This principle can also be realized by frictional engagement between the plastic head and the metal head.
• Other variants for forming a slip clutch between the handle and the clamping screw are possible.
• the force limiting means is formed by a compliant threaded insert.
• a compliant threaded insert This is, for example, a metal tongue inserted into a corresponding abutment of the clamp with a threaded opening in which the clamping screws be sitting.
• the bending strength of the metal tongue is preferably such that it allows a sufficiently tight tightening of the clamping screw without bending, but it then bends when the clamping screw is tightened too tight. This protects the terminal from overload. Should the threaded insert have been deformed in this way, it can be replaced by a non-deformed threaded piece, for example. If necessary, it may also be necessary to straighten and reinsert the deformed threaded insert.
• FIG. 1 shows a yarn feeding device, which is fastened by means of a fastening clamp on a support of a knitting machine, in a schematic side view,
• FIG. 2 shows the clamp of the yarn feeding device according to FIG. 1 in a vertically sectioned perspective view
• FIG. 3 shows the clamp according to FIG. 2 in a properly tightened state in a vertically sectioned illustration
• FIG. 4 shows the clamp according to FIG. 3 with the clamping screw tightened too tightly in an exaggerated representation
• FIG. 5 shows a serving as a force limiting means. Winding insert in perspective
• FIG. 6 is a sectional view of the threaded insert according to FIG. 5;
• Figure 7 shows a modified embodiment of the force limiting means in a schematic, partially sectioned view
• FIG. 8 shows the force limiting means according to FIG. 7 under overload.
• Figure 1 illustrates a yarn feeding device 1, which is designed as a positive yarn feeding device and serves to deliver a yarn 2 to a thread-consuming point, for example, the knitting point of a knitting machine.
• yarn feeding devices 1 are arranged on a support 3 of a circular knitting machine, which is then formed as a closed ring.
• Figure 1 illustrates this support 3 in vertical section.
• the yarn feeding device 1 has a central holder 4, to which e.g. a vertically oriented rotatably mounted shaft 5 with pulleys 6, 7, a clutch 8 for selectively rotationally fixed coupling one of the pulleys 6, 7 with the shaft 5 and a yarn feed wheel 9, which is rotatably connected to the lower end of the shaft 5 with this.
• other elements may be provided, such as a yarn brake 10, yarn guide 11, 12, a functional example serving as a signal lamp housing 13 or other elements that are not illustrated, such as yarn feelers or the like.
• the holder 4 is preferably made of plastic or a light metal, such as aluminum, zinc die casting or other non-ferrous metal.
• a terminal 14 is formed or provided on the holder 4.
• the clamp 14 may be an integral part of the holder 4, for example by the holder 4 and the terminal 3 are formed as a single plastic injection molded part, plastic injection-molded part, metal injection molded part or metal injection-molded part.
• the clamp 14 encloses a receiving space 15 for the carrier 3 on three sides.
• two legs 16, 17 extend downwards from the holder 4, wherein they define the receiving space 15 between each other.
• a Clamping screw 18 is arranged, which serves for tightening the holder 4 to the carrier 3.
• the opposite leg 17 serves as an abutment. He may have a receptacle for a cable such as a ribbon cable 19. While an edge of the cross-sectionally preferably rectangular support 3 rests against the corresponding leg 17, the clamping screw 18 is perpendicular to the opposite edge of the carrier 3 and biases it against the leg 17th
• the clamping screw 18 may, as illustrated in FIG. 2, be a machine screw with a head 20 that is encapsulated by a plastic head 21.
• the plastic head 21 has a larger diameter than the head 20 and is used for manual actuation of the clamping screw 18th
• the KunststoffStoffköpf 21 is preferably rotatably connected to the head 20. It can leave a central area of the head 20 free, e.g. a hexagonal opening 22 for the attachment of a tool, such as an Allen wrench leaves free. Thus, a tool actuation of the clamping screw 18 is possible.
• the clamping screw 18 is preferably inserted into a threaded opening 23 of a piece of sheet metal 24 which is held on the leg 16 of the terminal 14.
• the sheet metal piece 24 serves as a force limiting means 25. It ensures that between the two legs 16, 17 acting and the legs 16, 17 away from each other exciting force even when excessive tightening of the clamping screw 18 can not be so large that the Terminal 14 would be damaged.
• the sheet metal piece 24, as shown in particular in FIG. 3 is gripped at an end 26 remote from the threaded opening 23 in an abutment 27, which is supported by a tab 16 formed on the leg 16. see 28 is formed. For this projecting only at one end mounted sheet metal piece 24 like a tongue down and carries the clamping screw 18th
• FIG. 3 illustrates the properly tensioned state of the terminal 14.
• the clamping screw 18 is tightened, wherein the carrier 3 between the end face of the clamping screw 18 and the opposite leg 17 is tensioned.
• the sheet metal piece 24, as illustrated in FIG. 4, can deform, in particular bend. It therefore deviates from the leg 17 away, wherein it may experience a preferably elastic or plastic but also bending. It thus acts as a force limiting means 25.
• the inclined position of the clamping screw 18 which occurs during overload, it touches the contact surface or bore wall with its thread or shaft, whereby a braking torque is created. The operator feels increased resistance and does not tighten the clamping screw 18 more tightly. Damage to e.g. made of plastic terminal 14 is avoided.
• the sheet metal piece 24 can be exchanged for a replacement part.
• the yarn feeding device takes no damage.
• Figure 5 illustrates the sheet metal piece 24 in a somewhat modified form, e.g. with reduced sheet thickness.
• the threaded opening 23 can be made here as a passage, as can be seen in particular from Figure 6. In this way, a sufficient thread length at the threaded opening 23 is achieved even with very small plate thickness.
• the piece of sheet metal 24 can also be gripped on corresponding edges 27a, 27b in corresponding abutments 27a, 27b in corresponding pockets 28a, 28b which, for example, open towards one another in the form of grooves.
• a deformation of the sheet metal piece 24 is, as Figure 8 shows, by over tightening the clamping screw 18 possible. While in the embodiment according to FIGS. 3 and 4 an inclination of the clamping screw 18 occurs in case of overload and indicates the overload, this is not the case in the embodiment according to FIGS. 7 and 8. Nevertheless, an overload of a plastic clamp is effectively prevented.
• the sheet metal piece 24 and a plastic tongue of the terminal 14 can be used as a force limiting means 25.
• the tongue is resilient and has a threaded hole with or without metal insert. A deformation of the tongue leads, as explained above, to the inclination of the clamping screw 18 and to the start thereof on a contact surface or wall of a corresponding bore, through which the clamping screw 18 also extends.
• the plastic tongue or the deformable sheet metal piece 24 may also be a rigid, in or on the clamp 14 elastic stored element with threaded hole, in particular a metal element for receiving the clamping screw 18 find application. Under certain circumstances, it may also be possible to form the element 24 as a component of the holder 4 in one piece with the latter and, if desired, also from the same material.
• An inventive yarn feeding device or other device has a terminal 14 with an overload protection in the form of a force limiting means 25.
• This is preferably formed by a deformable wearing part, for example in the form of a sheet metal piece 24, which carries the clamping screw 18.
• the sheet metal piece 24 is dimensioned with regard to its bending strength so that on the one hand allows a secure tightening of the terminal 14, but on the other hand prevents damage to the terminal 14, in particular their expansion.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Knitting Machines (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

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Citations (3)

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• 2007
  • 2007-06-27 CN CN2007800534736A patent/CN101688338B/zh active Active
  • 2007-06-27 DE DE112007003544.7T patent/DE112007003544B4/de active Active
  • 2007-06-27 WO PCT/EP2007/005680 patent/WO2009000300A1/de active Application Filing
  • 2007-12-14 TW TW096147794A patent/TWI365239B/zh active

Patent Citations (3)

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